<div><br></div><div>Help! I have a single telco PRI terminated in a RAS (dial-up V.90 modems) that is only serving a few users at this point, but they don't have any other access options (other than satellite) so we continue to run it...</div>
<div><br></div><div>I would like to move the access numbers to our main PRI that terminates in an MGCP gateway on a Cisco 2811 and then provide a "network side" PRI from that same 2811 to the RAS box so I don't have to pay for a full PRI for just a few concurrent users.</div>
<div><br></div><div>Everything seems to work except when I route the PRI through the 2811, negotiated speeds drop way down and retrains go way up. Often a modem will retrain 10 times and just give up.</div><div><br></div>
<div>The incoming PRI (from telco) and the outgoing PRI (towards RAS) are both on the same 2811, so I presume packet loss and jitter shouldn't be an issue -- I am wondering if it is somehow a clock issue? Do I just give up because this is unrealistic?</div>
<div><br></div><div>Here is the relevant IOS config - 0/0/0 is my normal voice PRI, 0/1/0 is the PRI normally going directly to the RAS , 0/1/1 is the PRI provided to the NAS (note the isdn protocol emulate network)</div>
<div><br></div><div>========================================================</div><div><div>network-clock-participate wic 0</div><div>network-clock-participate wic 1</div><div>network-clock-select 1 T1 0/0/0</div></div><div>
<br></div><div><div>controller T1 0/1/0</div><div> framing esf</div><div> linecode b8zs</div><div> cablelength short 133</div><div> pri-group timeslots 1-24 service mgcp</div><div>!</div></div><div><div>controller T1 0/1/1</div>
<div> framing esf</div><div> linecode b8zs</div><div> cablelength short 133</div><div> pri-group timeslots 1-24 service mgcp</div></div><div>!</div><div><div>interface Serial0/1/0:23</div><div> no ip address</div><div> encapsulation hdlc</div>
<div> isdn switch-type primary-ni</div><div> isdn incoming-voice voice</div><div> isdn bind-l3 ccm-manager</div><div> no cdp enable</div><div>!</div></div><div><div>interface Serial0/1/1:23</div><div> no ip address</div><div>
encapsulation hdlc</div><div> isdn switch-type primary-ni</div><div> isdn protocol-emulate network</div><div> isdn incoming-voice voice</div><div> isdn bind-l3 ccm-manager</div><div> no cdp enable</div></div><div><div>!</div>
</div><div><div>mgcp modem passthrough voip mode nse</div></div><div><br></div><div><br></div><div><br></div><br><br><br><br>